Nibbling attachment for drill presses



Sept. 10, 1940. Q HEYDENBURG 2,214,584

NIBBLING ATTACHMENT FOR DRILL`PRESSES Filed Sept. 5. 1938 2 Sheets-Sheetl www* ATToe/vey Patented Sept. 10, 1940 UNITED STATES NIBBLINGATTACHMENT FOR.` DRILL PRESSES Clair W. Heydenburg, Los Angeles, Calif.Application September 3, 1938, Serial No. 228,412

. 1 Claim.

This invention relates generally to power tools, and more particularlyto drill presses.

An object of the invention is to provide a nibbling device particularlyadapted, although i not necessarily for use in conjunction with a powerdrill press, by utilizing the latter as a support and as a drivingmeans, all in such manner that the device will not require `any means tofasten it in place and will not subject the drill l press spindle to anydestructive forces or premature wear, yet will enable the device torapidly and accurately nibble away the edge of sheet metal or othermaterial as fed to the nibbling punch of the device by an operator,whereby to 1-3 eliminate a separate and costly nibbling machinerequiring large floor area and, therefore, not available for relativelysmall machine shops.

Another object of the invention is to provide a nibbling device of theabove described character So having means by which it can be readilyadjusted to compensate for wearing away of the nibbling punch and forinternal nibbling operations, as well as enabling the nibbling punch tobe rotatively adjusted in order that work can be fed to s the punch fromvarious directions.

A further object of the invention is to provide a nibbling device whichis relatively inexpensive, extremely compact so as to render itconveniently portable, and which can be applied to and re- .'o movedfrom a drill press with the utmost ease and dispatch.

With these and other objects in view, the invention resides in thecombinations, arrangements and functional relationships of elements asset forth in the following speciiication, and

particularly pointed out in the appended claim.

In the accompanying drawings,

Figure 1 is a view in side elevation, and showing the nibbl'ing deviceembodying this invention 40 applied to a drill press;

Figure 2 is a horizontal sectional View taken on the line 2-2 of Figure1;

Figure 3 is an enlarged vertical longitudinal sectional view of thenibbling device, taken on 45 the line 3 3 of Figure 2, and showing thenibbling punch in its upper extreme position;

Figure 4 is a sectional view similar to Figure 3 and showing thenibbling punch in its lower extreme position.

50 Referring specifically to the drawings, the invention comprises asupport Ill including a rectangular base portion Il having a work plateI2 and feet I3 at its corners on which the support can be rested uponthe table T of a drill press P.

55 From the base portion ll projects an overhangving arm I 4, the freeend of which is provided withv an opening I5 therethrough, slidablyreceiving a mounting sleeve I6 externally threaded at I'I and Ila toreceive nuts E8 and I9 adapted to co-act H with opposite sides ofthe armin clamping the 5l sleeve thereto in' various axially and rotativelyadjusted positions for a purpose to be later described.

Mountedv in the cylindrical bore 2Q of the y I mounting sleeve I3 is apunch holder 2| confined 10 to reciprocating motion in the sleeve bymeans of a pin 22 threaded into the holder and working in a longitudinalslot 23 in the sleeve. The upper end of the holder is of a diameter toprovide a A working fit in the bore 20, whereas the remaini5' der Voithe holder is of reduced diameter to provide an annular space betweenthe holder and sleeve for a coil spring 24 which abuts the lower endwall 25 of the sleeve and the enlarged upper end of the holder forco-action therewith in urging the holder upwardly.

The lower end of the holder is guided by and projects through an openingin the end wall and is provided with a socket 26 receiving a nibblingpunch 2l secured in place by a set screw 25 28. During reciprocatingmotion of the holder 2 I, the punch 21 co-acts with a die 23 secured bya set screw 30 in a socket 3l provided in the base portion Il inco-axial relationship to the axis of the holder and mounting sleeve. 30

The upper end face of the holder 2l is formed to provide a cam 32 withwhich is adapted to co-act a complementary cam 33 formed on the lowerend face of a stub shaft 34 rotatably mounted in a plain bearing 35supported by a cap 35 36 threaded at 31 into the upper end of themounting sleeve I6, A ball thrust bearing 38 is interposed between theshaft and cap, and nuts 39 and 40 are threaded on the shaft at 4I forcoaction with the bearing 38 in confining the shaft 40 against axialdisplacement.

The upper end of the shaft 34 is reduced in diameter to form a shank 42adapted to be received and clamped in the chuck C of the drill press Pwhen the support IIJ is resting on the 45 table T of the press as isshown in Figure 1, whereby to provide a detachable driving connection bywhich the shaft 34 will be driven by the spindle S journaled in the headH of the drill press.

The support I0 is provided with a boss 43 in which is screwed a rod 44having a sleeve 45 of elastic rubber and forming an arm of sufcientlength to engage the column K of the drill press for co-action therewithin preventing rotation of 5,.

the support I0 on the table T during the operation of the invention,which is as follows:

With the support Il] resting on the table T andv wherein the nibblingedge or shoulder 27d of the punch 27 clears the platen l2 suflicientlyfor the insertion of the metal to be worked upon between the punch andplaten. v

As rotation of the shaft 3d is effected, the camsl 32 and 33 co-act toforce the holder 2l axially downward against the action of the spring24, to the other extreme position shown in Figure 4, wherein thenibbling edge 2id of the punch 21 enters the die 29. It will thus beclear that by manually feeding a sheet of metal on the platen l2, andproperly manipulating the edge of the metal with respect to the punch2", the latter will nibble away the edge so that the edge can be givenany contour desired.

By loosening the nuts i8 and I5, the mounting sleeve l5 can be raised orlowered to vary the working position of the punch 2l' vertically withrespect to the platen l2 so as to compensate for wearing away of thenibbling edge 27a aswell as to dispose such edge at the position mosteffective in nibbling metal of a particular thickness. By thisarrangement, the mounting sleeve can also be raised sufficiently toclear the punch .2l from the platen in order to permit a sheet of metalto be inserted beneath the punch for internal nibbling. Likewise themounting sleeve can also be rotatively adjusted to vary thecircumferential position of the nibbling edge, and thus permit the Yindrilling operations.

work to be fed to and acted upon by the punch from various directions,whereby to accommodate sheets of various proportions and contours.

It will be noted that as ther nibbling device merely rests upon thetable T and is entirely free of any direct attachment thereto by a rigidor extraneous fastening means, no destructive forces incident to thedriving of the shaft 34 by the spindle S will be set up in the latter,and thatthe spindle will be subjected only to the usual torque and endthrust as are' imposed thereon The functioning of the arm 44 does notaffect this condition, as the arm merely prevents rotation of the deviceVon the table T, under the rotative tendency of the shaft 34.

AWhat is claimed is:

A nibbling device comprising a support having a die; a mounting sleeveaxially and rotatively adjustable'in the support and co-axiallyrelatedto said die; nuts on the sleeve co-actable with the support to securethe sleeve in a selected position of adjustment; a punch holder mountedin the bore of the sleeve; a nibbling punch carried by the holder andco-actable with the die; means for confining said holder toreciprocating motion axially in the sleeve; a cam on an end face of saidholder; a shaft journaled in said holder and having a cam on an end facethereof co-actable with the cam of the holder to move the latter to oneextreme position in response to rotation of the shaft; a spring in thesleeve co-acting with the holder to urge the lat'ter to its otherextreme position; a shank on said shaft adapted to be clamped in thechuck of a drill press when the support is disposed on the table of thepress; and an arm on the support adapted to engage the column of thedrill press to prevent rotation of the support.

CLAIR W. HEYDENBURG.

